Apparatus for making paper-stock



(No Model.)

J. D. TOMPKINS.

I APPARATUS FOR MAKING PAPER STOCK. No. 394,031.

Patented Dec. 4, 1888.

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N. PETERS. Phnlniillmgnphon \vmm mn. 0 cv UNITED STATES PATENT OFFICE.

JOHN D. TOMPKINS, OF NASSAU, NEIV YORK.

APPARATUS FOR MAKING PAPER-STOCK.

SPECIFICATION forming part of Letters Patent No. 394,031, dated December 4, 1888.

Application filed February 9, 1886. Serial No. 191,487. (No model.)

To all whom it may concern:

Be it known that I, JOHN D. ToMPmNs, a citizen of the United States, residing at Nassau, in the count; of Rensselaer and State of New York, have invented certain new and useful Improvements in Apparatus for Making Paper-Stock, of which the following is a specification.

My invention relates to im n'ovements in apparatus for making paper-stock of wood, straw, gra 'es, and other vegetable substances 3 and it consists of the devices and parts and combinations of devices, and parts and elements hereinafter particular] v described, and specifically set forth in the claims.

The object. of my invention is to provide means by which I am enabled to carry into practice a new process of treating vegetable substances-such as wood, straw, grasses, &c.for their conversion into paper stock or pulp,which process is full v described in United States Letters Patent No. 370,640, granted to me April 27, .1886. I attain this object by the mechanism illustrated in the accompanying drawing, forming a part of this specification.

In the drawing, A is the shell of the digester, which shell can. be made of any suitable material. This shell incloses the digesting-chamber A and the upper and lower liquor-chambers, (3' C. These latter chambers are separated from the digesting-chamber by the concave-convex perforated walls or diaphragms l; B. This shell A, with the said chambers A and with the perforated walls or diaphragnis I ll, constitute the digestcr. \Vith this digcster I use two s vstems of litpior-eirculati'ng pipes and pumps. Of these pipes, e 0 connect the lower liquorchamber, C, with the upper chamber, C, and

a pump, E, in the course of these pipes e e,

operates to draw the liquors from the upper chamber, 0, and discharge the same into the lower chamber, t. The other pipes /"f", also connect the said two chambers C, and a pump, F, in the course of these pipes ff, opcrates to draw the liquors from the lower chamber, (1, and discharge the same into the upper chamber, C.

\Vith pipe c are connected the series of pipes H, I, J, and K, each leading from a suit.- able tank, (not shown,)-as, for instance, pipe II from a hot-water tank, pipe I from a coldwater tank, pipe .I from an alkali or chemicalliquor tank, and pipe K from a bleachingliquor tank. Each of these pipes are provided with a suitable valve, 72, for cutting off or making communication at will of the respective pipes with pipes c e as will be required from time to time.

Connecting with pipe f are pipes Ii, M, and N, one of which, as pipe Ii, leads to a hot-water tank. (Not shown.) Another, as pipe M, leads to the spent alkali or chemical liquor tank, (not shown,) and the other pipe, N, to spent chlorine or bleaching-liquor tank. (Not shown.) These pipes L, M, and N are each provided with a suitable valve, 71, between pipef and the respective tanks these pipes connect with.

Pipes 6 c are provided with valves 1' and 21, and pipes f f are provided with valves Z Z for use, will be hereinafter described.

In the upper end of this digcster is provided a man-hole, I), for introduction of n1atcrial into the digesting-chamber A. This hole is closed bv the plate (I and crows-foot and bolt in the usual manner. The lower end of the digester is provided with discl'largepipe D, having a suitable valve, (7, for the discharge of the finished product from the digesting-chamber.

G is a waste-liquor discharge-pipe provided with a suitable valve, g, by which waste liquors can be readily drawn from lower liquor-chamber, at will.

is a steam-pipeleadingfrom any suitable steam-genorator to pipe 0, and pipe 0 connects above with pipe 0 which communicates with the upper litpior-chamber, C, and be low with pipe which connects with lower chamber, (1. Pipes 0 and 0 are each provid ed with a suitable valve, n, for controlling the introduction of live steam into the chainbers (I C, respectively, as occasion may require, and pipe 0 is also provided with valve :1 and check-valve 12 Q is a pipe leading from the upper side of the upper eha1nber,C, to any suitable vessel (not shown) for receiving the bleaching-gas after it has sufficiently acted on the material. This pipe is provided with valve g.

P is a waste-steam pipe leading from the upper end of upper chamber, O, to any vessel to be heated, and it may be made to communicate by means of suitable branch pipes (not shown) with any vessels containingliquors for use in treating the material operated with for heating the same. This pipe P is provided with valve 19.

T is a tester connected with the digesterby means of a suitable pipe, and is provided with suitable valves for operating with the same as practiced by the trade.

This digester is alsoprovided with a safetyvalve and steamgage. (Not shown.)

The method. of using my improvedapparatus. when employed to ,carry the process to which I have referred into operation is as fol lows: The hand-plate (1 having been removed, the material to be treated is gradually introduced through the man-hole, at the same time the pump E is started, drawing the cooking liquid from the tank within which it is stored and injecting it into the lower chamber against the falling mass of material. After a certain amount of liquid has been introduced the pump F is started, drawing the cooking liquid from the lower chamber and delivering it into the upper chamber, from whence it is sprayed downward upon the material in the digesting-chamber. After the required charge of material and sufficient cooking liquid have been introduced the pump F is stopped, the pump E continued in operation, drawing the cooking liquid from the upper chamber and delivering it into the lower chamber and through the perforations therein in an upwardly-directed spray or series of fine streams against the material in the digesting-chamber, so as in effect to keep the material in suspension and prevent it from packing upon the perforated bottom of the chamber. A suitable pressure of steam is introduced through the pipes O O O O for the purpose of raising the temperature of the cooking liquid, whatever it may be, whether water, alkali, or other chemical liquid, as will be most suitable to be applied to the material to be treated. After circulating the liquor for a suitable length of time in the above-described direction pump E will be stopped and pump F will be operated and cause the liquor to be drawn downwardly through the digesting-chamber into chamber 0, and thence through pipes f and f be discharged into the upper chamber, G,to return to the digestingchamber. These pumps E and F will be operated alternately at will to produce the reversed directions of circulations of the treating-liquors, as above described, through the mass of material within the digesting-chamany light material which may accumulate against it. When the cooking of the material is completed, the pump E will be stopped and pump F will beloperated, and Valves 7r and Z will beclosed, excepting the valve h of the pipe L or M of the hotrwater or spent cookingliquor tank, (not shown,) when the liquor will be drawn off from the digester and introduced into its appropriate receiving-tank. When valve g is opened, the liquor in the digester w1ll run off by gravity and escape through a suitable pipe or sewer. (Not shown.) Washing-water will be introduced and circulated alternately in reversed directions through the pumps E and F and their respective coacting pipes by the alternate operations of said pumps, as above described. The bleachingliquor will also be introduced through pipes K e e and pump E and be circulated in alternating reversed directions by operating pumps E and F alternately,as above described. \Vhen the material has been bleached, valve q will be opened an d a slight pressure of steam will be introduced into the digesting-chamber from its lower end, when the gas from the bleaching-liquor will escape through pipe Q into the tank of liquor provided for its reception, after which the bleaching-liquor will be drawn from the digester, through the operation of pump F and its coacting pipes f, f, and N, and discharged into the tank for receiving the same. Taste steam will be permitted to escape through pipe P.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a machine for making paper-stock, the combination of a digesting-chamber, the upper and lower fluid-chambers communicating therewith, two pipes exteriorly connecting said fluid-chambers, and a pump in each of said pipes, respectively, substantially as and for the purpose set forth.

2. In a machine for making paper-stock, the combination of a digesting-chamber, the upper and lower fluid-chambers communicating therewith, two pipes exteriorly connecting said fluid-chambers, a pump in each of said pipes, respectively, and a pipe connecting with the bottom of said digesting-cham ber, substantially as and for the purpose set forth.

3. In a machine for making paper-stock, the combination of a digesting-chamber, upper and lower fluid-chambers communicating therewith, two pipes exteriorly connecting said fluid-chambers, a pump in each of said pipes, respectively, and an inlet and outlet pipe connecting, respectively, with said communicating pipes, substantially as and for the purpose set forth.

J. D. TOMPKINS.

\Vitnesses:

ALEX. SELKIRK, CHARLES WETHERWORX. 

